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Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685, 2017년, pp.342 - 348   SCI SCIE
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Evidence for superplasticity in a CoCrFeNiMn high-entropy alloy processed by high-pressure torsion

Shahmir, Hamed (Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK ); He, Junyang ( State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 10083, People's Republic of China ); Lu, Zhaoping ( State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 10083, People's Republic of China ); Kawasaki, Megumi ( Division of Materials Science and Engineering and the Research Institute of Industrial Science, Hanyang University, Seoul 133-791, South Korea ); Langdon, Terence G. ( Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK );

  • 초록  

    Abstract A CoCrFeNiMn high-entropy alloy was processed by high-pressure torsion to produce a grain size of ~10nm and then tested in tension at elevated temperatures from 773 to 1073K using strain rates in the range from 1.0×10 −3 to 1.0×10 −1 s −1 . The alloy exhibited excellent ductility at these elevated temperatures including superplastic elongations with a maximum elongation of >600% at a testing temperature of 973K. It is concluded that the formation of precipitates and the sluggish diffusion in the HEA inhibit grain growth and contribute to a reasonable stability of the fine-grained structure at elevated temperatures. The results show the activation energy for flow matches the anticipated value for grain boundary diffusion in nickel but the strain rate sensitivity is low due to the occurrence of some grain growth at these high testing temperatures.


  • 주제어

    CoCrFeNiMn .   High-entropy alloy .   High-pressure torsion .   Severe plastic deformation .   Superplasticity.  

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